package servlet;

import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.Cookie;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

/**
 * Servlet implementation class IndexServlet2
 */
@WebServlet("/IndexServlet3")
public class IndexServlet3 extends HttpServlet {
	private static final long serialVersionUID = 1L;
       
    /**
     * @see HttpServlet#HttpServlet()
     */
    public IndexServlet3() {
        super();
        // TODO Auto-generated constructor stub
    }

	/**
	 * @param username 
	 * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
	 */
	protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		String username =null;
		HttpSession session=request.getSession();
		username=(String)session.getAttribute("username");
		
		request.setAttribute("username", username);
		
		request.getRequestDispatcher("index.jsp").forward(request, response);
		
//		request.removeAttribute(name);  //removeAttribute 方法是移除对象
//		session.removeAttribute(name);  
//		request.getServletContext().removeAttribute(name);  
 	}

	/**
	 * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
	 */
	protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		// TODO Auto-generated method stub
		doGet(request, response);
	}

}
